Renewable cartridge-fuse.



A. L. EUSTICB RENEWABLE CARTRIDGE FUSE.

APPLICATION TILED MAR.20,1914.

Patented Feb. 23, 1915.

UNITED STATES PATENT OFFICE.

ALFRED L. EUSTICE; OF CHICAGO, ILLINOIS, ASSIGNOR TO ECONOMY FUSE & MANU- FACTURING COMPANY, OF CHICAGO, ILLINOIS, A. CORPORATION OF NEW YORK.

RENEWABLE CARTRIDGE-FUSE.

Application filed March 20, 1914.

. T all whom it may concern Be it known that I, Aprnnn L. Ensues, a citizen of the United States, residing at Cl11cago, in the county of Cook and titate pf Illinois, have invented certain new and useful IIHPIOVEHIQXHZS in Renewable Cartridge-Daisies, of which the following is a specification] My invention relates to renewable cartridge fuses, and refers particularly, although not exclusively, to the so-called ferrule type of fuses.

It is the object of my invention to provide means for tightly clam 'iing the fusible link between electrically conducting parts in such manner that a tight contact is always maintained between the fuse link and these parts.

It is a further obj-cot of my invention to so construct the fuse that the various parts may be quickly and easily assembled and disassembled, so that after the fuse has blown, a new fusible link may be readily placed in position.

These and other objects of my invention will be more readily understood by reference to the accompanying drawings, in which:

Figure 1 is a side elevation of my improved fuse. Fig. 2 is a longitudinal section taken on the line zl i of l ig. 1. Fig. 3 is an end elevation of the fuse shown in Figs. 1 and Fig. l is a transverse section taken on the line -ll of Fig. 2. Fig. 5 is an enlarged fragmentary longitudinal section showing the manner in which the fusible link is clamped in position. and Fig. 6 is a perspective of one of the end washers in? the fuse.

he fuse of my invention is of the inclosed 2e and is provided with a tubular shell 10 of liber, or other suitable non-conducting material. The fusible link 11 is preferably flat, and extends through the interior of the shell 10. At each end, the link 11. is held in position between the clamping arm 12, fastened to the cap 13, and the clan'iping arm 1 1 of the end washer 15. Each end of the link 11 is bent over the washer l5 and is held in position between said washer and the cap 13. The cap 13 is provided with an aperture 16, through. which a portion of the end of. the link 11 may be seen.

As clearly shown in Fig. 2, each of the end washers 15 abuts against an end of the shell Specification of Letters Patent.

Patented Feb. 23, 1915.

Serial No. 825,957.

10 and is held in position by means of the cap 13, which fits over the end of the shell and is held in position by the screw 17, which passes through suitable apertures in the cap 13 and the shell 10. Each of the screws 17 has a threaded end 18, which, as best shown in Fig. 5, engages a threaded aperture in the clamping arm. 11 of the end washer 15. The aperture 19 through the clai'nping arm 12 is slightly larger than the threaded end 18 of the screw 17; The screv. 17 is provided with a shoulder 20, which is adapted to engage the clamping arm 12. The link 11 is provided at each end with an aperture .21, registering with the apertures of the clamping arms 12 and 11. It will be evident that when the screw 17 is screwed home, the clamping arm 11 of the end washer 15 will be drawn toward the clamp ing arm 12 and the fusible link 11 will be tightly clamped in position with an excellent electrical contact.

I have particularly described my inven-- tion as adapted for inclosed fuses of the socalled ferrule type, but it will be evident that it may also be used for fuses of the knife-blade type by extending the clamping arms 12 to form the blades 2:2, as indicated in dotted lines in Figs. 1, 2 and 3. It will also be evident that whereas I prefer to use a flat link as the fusible element, a round wire may also be readily employed. In order to allow the gases generated by a violent blowing of the fuse to gradually escape, 1 preferably employ, near each end of the shell 10, the helical venting passage 23,

which causes the gases to become materially cooled before reaching the atmosphere.

\Vhcn it desired to disassemble the fuse, as for example after the fusible link has been blown, it is only necessary to remove the screws 17. after which the caps 13 are readily removed from the ends of the shell 10, and the end washers 15 may alsd be removed. In assembling the fuse, the end washers are first placed in position, the fusible link 11 is then placed in the position indicated in Fig. :2, with the apertures 21 registering with the apertures in the clamping arms 12 and ll, theeaps are then applied and the screws 1? finally inserted, by means of which the caps are secured in posh tion and the link is securely clamped between the clamping arms 12 and 11-.

It will be apparent to those skilled in the art that many changes could be made in the detailed construction of the various parts which I have described Without departing from the spirit or scope of my invention.

What I claim is:

1. In a cartridge fuse, tlie combination of a shell, an end cap fitting over each end of said shell, a clamping arm fastened to each of said end caps and projecting within said shell, an end washer between each end of said shell and said cap, said Washer being provided with a clamping arm extending parallel with the clamping arm of said cap, a fusible link extending through said shell and between theclamping arms of said caps and said washers and a screw at each end of said shell, said screw passing through said end cap and said shell and adapted to draw the clamping arms of said cap and said end washer toward each other, thereby securely fastening said link in position, substantially as described.

2. In a cartridge fuse, the combination of a shell, a fusible link passing through s: id shell, an end cap fitting over each end -if said shell, means for electrically connecting said link to-said end caps, and a helically disposed venting passage cut in the exterior surface of said shell at each end thereof, whereby the gases formed by the blowin of said fuse will gradually escape through said passage to the atmosphere, substantially as described.

3. In a cartridge fuse, the combination of a shell, an end cap-fitting over each end of said shell, a clamping arm fastened to each of said end caps and projecting within said shell, an end washer between each end of said shell and said cap, each of end washers having a. clamping arm extending parallel with the clamping arm of said c; and each clamping arm of said washer having a threaded aperture therein, a fusible link extending through said slieli and be tween the clamping arms of said caps and said washers, said link having apertures registering with the apertures in the clamping arms of said washers, and a screw adapted "to hold each of said caps in position, said screw engaging the threaded aperture of each of said clamping arms of said end Washers and having shoulders engaging each of said clamping arms of said caps, whereby the clamping arms of said caps and said washers may be drawn toward each other and securely hold said link in position, substantially as described.

i. In a cartridge fuse, the coi'nbination of a shell, an end cap ntting over each end of said shell, and a helically-disposed renting passage cut in. the exterior surface of said shell at each end thereof, whereby the gases formed by the blowing of the fuse will cape through said passages to the atmosphere.

ALFRED L. E U STIC E.

Witnesses:

Jno. J SORBER, J. B. Gnrrrrrn. 

